Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f3c8cfbecc431a…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 09:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 190d54f78de51b4edff3bd6620763e8d SHA-1: f8caf795c4717e31d6bfbe7495c1f9357bb1e7b0 SHA-256: 43f3c8cfbecc431af95b5359e4f16358c54589e087e39c8cf2d5df4b6bee145c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a '2006 rav4 repair manual', suggesting a social engineering pretext. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=2006+rav4+repair+manual
    • https://static.usrfiles.com/ugd/b8c837_2f4c05d4cd9f4809ad1a8fb468ce694b.pdf
    • https://static.usrfiles.com/ugd/b8c837_22f20fd1762a4057ae04fd19e1d84c00.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed772f1c0c674c6e80a2d0d2cfbef103.pdf
    • https://static.usrfiles.com/ugd/b8c837_16dc2e97a4ea4aefa879417699f4ae95.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/92143805556.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/buvas.pdf
    • https://static.usrfiles.com/ugd/b8c837_df087bd10e5f419e8aa4f439edae7421.pdf
    • https://static.usrfiles.com/ugd/b8c837_e08573026cd543ae8787159d4bc6f7f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b05a48b739514b51a755264b2be66eba.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d963c41c3254c718a19e9826dba365e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0378499d807e41d8b2a47aa2df882a6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d3958e0544203acd54e37eeedbea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3e26e588d44a439b6545c18e965d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f8a029946d3408e825861c7e560cda5.pdf
    • https://static.usrfiles.com/ugd/b8c837_574478db8c164d8684529770df75ca34.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006020.bin
2b9a1e691247e1b627f37a3bfa72aae463ae70fb3a1294a629e45b4c2428d0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x6020 5268 bytes
font_01_sfnt_off000071f1.bin
996a967fc0398b4d168ef59710e2bd76af5d2e3f13119f643bb63b26471d0267
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F1 10188 bytes